Different price classes - Marantz PM6007 costs roughly 1.8x what NAD D 3020 V2 does. Expect it to lead on paper; the question is whether you will hear the difference through the speakers you own.
| Area | Better | Why |
|---|
| Power | B | Marantz PM6007 has more power - 45W against 30W into 8 ohms. That is about 1.8dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate NAD D 3020 V2 the better fit for desk or near-field listening, and Marantz PM6007 for a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Noise floor | B | Marantz PM6007 is the quieter design on paper - 102dB against 98dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | evenly matched | Both have a DAC on board with much the same capability. |
| Analogue inputs | B | Marantz PM6007 takes more analogue sources - 4 against 1. |
| Room to grow | evenly matched | The same expansion options on both. |
| Amplifier class | depends | NAD D 3020 V2 is Class D and Marantz PM6007 is Class A/B. Class D runs cool and draws almost nothing at idle; Class A/B runs warm and is the long-established mainstream choice. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | NAD D 3020 V2 takes up about 92% less shelf area (146cm² against 1764cm²), and it is 151mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | NAD D 3020 V2 costs less - $499 against $899 at list. |
A NAD D 3020 V2 B Marantz PM6007
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
The usual trade-off: Marantz PM6007 measures better, NAD D 3020 V2 costs about 44% less. With most speakers in most rooms that gap is smaller in practice than it looks here. Think about the whole system: the roughly $400 saved by taking the cheaper one would buy better speakers or a subwoofer, which does more for the sound than the difference between two competent amplifiers.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.